Hisense AHM-080HCDSAA - Page 357

336
Troubleshooting
Phenomenon Cause Check item Action (Turn OFF Main Switch)
Activation of the
high-pressure
switch due to
the excessively
high discharge
pressure (PSH)
Outdoor Unit:
Insu󰀩cient Air Flow to the Heat Exchanger
(Outdoor Heat Exchanger during the Cooling Process)
Indoor Unit:
Insu󰀩cient Water Flow to the Heat Exchanger
Indoor Heat Exchanger (during the Heating Process)
Check the heat exchanger for
dust or for clogging
Remove the dust or the
clogging
Check the air lter for dust Remove the dust
Check for any obstacles at the
inlet or the outlet of the heat
exchanger
Remove the obstacles
Check the service area Secure service area
Check the speed
(Outdoor Fan: Cooling)
Replace the fan motor if faulty
Check the speed of the water
pump
Replace the water pump if
faulty
Expansion valve malfunction or abnormality
Disconnected
Fix the looseness or reconnect
the connector
Fully closed and locked Replace the expansion valve
Check the operation sound of
the coil
Replace the coil
Check the Discharge Gas
thermistor
Replace the thermistor
Check the fastening of the
thermistor
Re-fasten the thermistor
Excessively High Water Temperature in the indoor unit
Calculate the heat load
Reduce the heat load or use a
bigger unit
Check minimum water
ow
Provide good circulation
Check for collapse in water
cycle
Remove the short-circuited
Check for other heat source Stop the heat source
Faulty High-Pressure Switch
Faulty Pressure Switch
Measure the discharge
pressure. Check the continuity
after the decrease of the
pressure
Replace the pressure switch if
faulty
Insu󰀩cient Contacting
Measure the resistance by
means of a tester
Fix the looseness. Replace the
connector
Incorrect Connection Check the connections Repair the connections
Overcharged refrigerant
Check the cycle operation
temp.
Charge the refrigerant correctly
Mixture of the non-condensate gas in the refrigerant
cycle
Check the air temp. and the
pressure
Recharge the refrigerant after
the vacuum pumping
Clogging of the discharge piping Check for clogging Remove the clogging
Liquid line stop valve or gas line stop valve is not in
operation
Check the stop valves Fully Open the stop valves